Antminer A3 (815Gh) vs A21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 1275 W | 1800 W | |
| Release | 2018-01 | 2025-01 | |
| Best opportunity |  SCPNetwork |  NEXANetwork | |
| Profit/day | $-2.42 | $4.20 | |
| Score | 33/100 | 66/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | Antminer A3 (815Gh) | A21 | |
|---|---|---|---|
| Blake (2b) | 815 GH/s1275 W · 639.2 MH/s/W | not supported | |
| NexaPoW | not supported | 3.4 GH/s1800 W · 1.889 MH/s/W |